Maltz thought the best word for this might be lIwnal, though maybe not: the cultural connotations are a bit different since, in Klingon culture, everything associated with a lIwnal lacks honor, and this is not necessarily the case for a (Terran) king's concubines or courtesans. Note that only married people could have a partner who could be considered a lIwnal. Also, lIwnal could be male or female, so if it's necessary to distinguish, say loD lIwnal or be' lIwnal.

(Marc Okrand to Lieven L. Litaer talking about the Hamletmachine, November 2019)